iPhone 5: Sprint to Verizon?

Hi, I'm a Verizon customer. I sold my iPhone 5 to T-Mobile customer in August. I know the Verizon 5 is unlocked, and his tmo Sim worked fine.

I have a chance to buy another iPhone 5 from a friend now on Sprint. I was under the impression that all iPhone 5's were unlocked, but when searched google, I got all sorts on conflicting information. Could someone here clarify?

Something you CAN try. I've seen people claiming they didn't have the GSM locked. Try borrowing a SIM card from someone you know on AT&T or T-Mobile. The CDMA model included some GSM bands. You may be able to go that route instead. You'd want to check the tech specs to see if the GSM/LTE bands you're wanting to use would still work.